Masters Theses


"Systems in which two or more energy sources combine to supply power to a common load are called hybrid energy systems. Applications of these systems have grown due to their flexibility and reliability. Hybrid energy systems have been successfully implemented in hybrid electric vehicles and wind-solar systems where two or more energy sources share the same load. Double-input (DI) dc-dc power electronic converters (DIPECs) have been gaining popularity in hybrid energy systems due to their reduced component count and control simplicity. In addition, employing DIPECs increases the reliability, stability, and flexibility of the system. In this thesis, a small-signal model for one of the DIPEC topologies, the DI buckboost converter, is developed and compensator design is carried out based on the small-signal model. The compensators are designed to accommodate optimal power sharing between the sources. Theoretically, it is also proven in this thesis that the two inputs of the DI buckboost topology can be independently controlled which gives great flexibility in terms of the compensator design. Time domain analysis of the system is carried out with the compensators included and the results agree with the theoretical analysis. In addition to the small-signal modeling, a new control method called offset time control is also introduced and successfully applied to a DIPEC topology in this thesis. The control scheme is based on adjusting the offset time between the switching commands; which is proven to have a direct impact on the amount of current drawn from each input. Small-signal modeling of the offset time control scheme has been carried out to prove the improvement in the speed of response of the system when the offset time control scheme is applied"--Abstract, page iii.


Ferdowsi, Mehdi

Committee Member(s)

Kimball, Jonathan W.
Cox, Norman R.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


Sandia Laboratories


Missouri University of Science and Technology

Publication Date

Fall 2009


ix, 71 pages

Note about bibliography

Includes bibliographical references (pages 40-41).


© 2009 Deepak Somayajula, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Electric power production
Energy transfer
Hybrid power systems -- Design
Transients (Electricity)

Thesis Number

T 9586

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